RPGMemes

But you only gave them your name. You never submitted to control.

There's often stuff in fantasy about knowing a being's true name giving you power over them, so you wouldn't want to tell it to a fey. But if they literally took your name, then that would make it theirs, and now you know their true name. Also, according to the forgotten realms wiki, most people don't know their own true name. It's not the same as the name you go by.